LXR linux/drivers/media/radio/radio-rtrack2.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * RadioTrack II driver
   4 * Copyright 1998 Ben Pfaff
   5 *
   6 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
   7 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
   8 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
   9 *
  10 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
  11 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
  12 *
  13 * Fully tested with actual hardware and the v4l2-compliance tool.
  14 */
  15
  16#include <linux/module.h>       /* Modules                      */
  17#include <linux/init.h>         /* Initdata                     */
  18#include <linux/ioport.h>       /* request_region               */
  19#include <linux/delay.h>        /* udelay                       */
  20#include <linux/videodev2.h>    /* kernel radio structs         */
  21#include <linux/mutex.h>
  22#include <linux/io.h>           /* outb, outb_p                 */
  23#include <linux/slab.h>
  24#include <media/v4l2-device.h>
  25#include <media/v4l2-ioctl.h>
  26#include "radio-isa.h"
  27
  28MODULE_AUTHOR("Ben Pfaff");
  29MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
  30MODULE_LICENSE("GPL");
  31MODULE_VERSION("0.1.99");
  32
  33#ifndef CONFIG_RADIO_RTRACK2_PORT
  34#define CONFIG_RADIO_RTRACK2_PORT -1
  35#endif
  36
  37#define RTRACK2_MAX 2
  38
  39static int io[RTRACK2_MAX] = { [0] = CONFIG_RADIO_RTRACK2_PORT,
  40                              [1 ... (RTRACK2_MAX - 1)] = -1 };
  41static int radio_nr[RTRACK2_MAX] = { [0 ... (RTRACK2_MAX - 1)] = -1 };
  42
  43module_param_array(io, int, NULL, 0444);
  44MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
  45module_param_array(radio_nr, int, NULL, 0444);
  46MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  47
  48static struct radio_isa_card *rtrack2_alloc(void)
  49{
  50        return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
  51}
  52
  53static void zero(struct radio_isa_card *isa)
  54{
  55        outb_p(1, isa->io);
  56        outb_p(3, isa->io);
  57        outb_p(1, isa->io);
  58}
  59
  60static void one(struct radio_isa_card *isa)
  61{
  62        outb_p(5, isa->io);
  63        outb_p(7, isa->io);
  64        outb_p(5, isa->io);
  65}
  66
  67static int rtrack2_s_frequency(struct radio_isa_card *isa, u32 freq)
  68{
  69        int i;
  70
  71        freq = freq / 200 + 856;
  72
  73        outb_p(0xc8, isa->io);
  74        outb_p(0xc9, isa->io);
  75        outb_p(0xc9, isa->io);
  76
  77        for (i = 0; i < 10; i++)
  78                zero(isa);
  79
  80        for (i = 14; i >= 0; i--)
  81                if (freq & (1 << i))
  82                        one(isa);
  83                else
  84                        zero(isa);
  85
  86        outb_p(0xc8, isa->io);
  87        outb_p(v4l2_ctrl_g_ctrl(isa->mute), isa->io);
  88        return 0;
  89}
  90
  91static u32 rtrack2_g_signal(struct radio_isa_card *isa)
  92{
  93        /* bit set = no signal present  */
  94        return (inb(isa->io) & 2) ? 0 : 0xffff;
  95}
  96
  97static int rtrack2_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
  98{
  99        outb(mute, isa->io);
 100        return 0;
 101}
 102
 103static const struct radio_isa_ops rtrack2_ops = {
 104        .alloc = rtrack2_alloc,
 105        .s_mute_volume = rtrack2_s_mute_volume,
 106        .s_frequency = rtrack2_s_frequency,
 107        .g_signal = rtrack2_g_signal,
 108};
 109
 110static const int rtrack2_ioports[] = { 0x20f, 0x30f };
 111
 112static struct radio_isa_driver rtrack2_driver = {
 113        .driver = {
 114                .match          = radio_isa_match,
 115                .probe          = radio_isa_probe,
 116                .remove         = radio_isa_remove,
 117                .driver         = {
 118                        .name   = "radio-rtrack2",
 119                },
 120        },
 121        .io_params = io,
 122        .radio_nr_params = radio_nr,
 123        .io_ports = rtrack2_ioports,
 124        .num_of_io_ports = ARRAY_SIZE(rtrack2_ioports),
 125        .region_size = 4,
 126        .card = "AIMSlab RadioTrack II",
 127        .ops = &rtrack2_ops,
 128        .has_stereo = true,
 129};
 130
 131static int __init rtrack2_init(void)
 132{
 133        return isa_register_driver(&rtrack2_driver.driver, RTRACK2_MAX);
 134}
 135
 136static void __exit rtrack2_exit(void)
 137{
 138        isa_unregister_driver(&rtrack2_driver.driver);
 139}
 140
 141module_init(rtrack2_init);
 142module_exit(rtrack2_exit);
 143